Food mixer



FIG. 1 is a right side elevational view of a food mixer showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view; and

FIG. 6 is a top, rear, and left side perspective view thereof. 

The ornamental design for a food mixer, as shown and described. 